26
Troubleshooting
If you suspect something wrong
Check and take steps as described below.
If the described suggestions do not solve the
problem, it is recommended to take the unit to your
dealership. The product should be serviced only by
qualified personnel. Please refer the checking and the
repair to professionals. We shall not be liable for any
accidents arising out of neglect of checking the unit
or your own repair after your checking.
Never take measures especially for those other than
indicated by
italic
letters in “Possible Solution”
described below because those are too dangerous
for users to handle themselves.
Warning
¡
Do not use the unit in an irregular condition, for
example, without sound, or with smoke or a foul
smell, which can cause ignition or electric shock.
Immediately stop using the unit and consult your
dealership.
¡
Never try to repair the unit by yourself because it
is dangerous to do so.
Problem
Possible cause
a
Possible solution
No power to the unit
The power cord (battery, power and ground) is connected in the
wrong way.
a
Check the wiring.
Sound is not generated.
The sound volume level is zero (MUTE).
a
Turn [VOL] (Volume) clockwise to increase the sound volume.
There is contact between the external mute lead and the chassis.
a
Connect the external mute lead correctly. If the lead is unused,
insulate it.
The wiring of speaker lines are not correct, or a break or poor
contact arises.
a
Check the wiring in accordance with the wiring diagram.
Noise
There is an electromagnetic-wave generator such as a mobile phone
near the unit or its electrical lines.
a
Keep an electromagnetic-wave generator such as a mobile
phone away from the unit and the wiring of the unit. In case
that noise cannot be eliminated due to the wiring harness of
the truck, consult your dealership.
The contact of the ground lead is poor.
a
Make sure that the ground lead is connected to an unpainted
part of the chassis securely.
Noise is made in step with
engine revolutions.
Alternator noise comes from the truck.
a
Change the wiring position of the ground lead.
a
Mount a noise filter on the power supply.
Common
Some operations are not
executable.
Some operations are not executable in particular modes such as menu mode.
a
Read the operating instructions carefully and cancel the mode.
If the unit is still out of order, consult your dealership.
No sound from speaker(s)
BALANCE/FADER setting is not appropriate.
a
Readjust BALANCE/FADER.
There is a break, a short circuit, poor contact or wrong wiring
regarding the speaker wiring.
a
Check the speaker wiring.
The speaker channels are
reversed between right and left.
The speaker wiring is confused between right and left.
a
Perform the speaker wiring in accordance with the wiring diagram.
The sound field is not clear in
the stereo mode. Central
sound does not settled.
The plus and minus terminals at right and left channels of speakers
are connected reversely.
a
Perform the speaker wiring in accordance with the wiring diagram.
CQ̲BT5557U 10/11/25 10:26
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Summary of Contents for PP104078
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